JP6014737B1 - Constant water level valve device - Google Patents

Abstract

There is provided a constant water level valve device capable of easily adjusting a water supply start position, ensuring a water level difference between a water supply start position and a water supply stop position, and capable of operating an on-off valve stably. A constant water level valve device of the present invention includes an opening / closing valve that opens and closes a water outlet that discharges water into a water storage tank, and a drive body that drives the opening and closing valve. The drive body 15 includes a guide member 70 that hangs down from the link mechanism 20 connected to the on-off valve 13 and a float 42 that is movably held by the guide member 70. The float 42 that floats between the upper stopper 72 and the lower stopper 71 contacts the upper stopper 72 and the lower stopper 71 to operate the link mechanism 20 via the guide member 70 and close the on-off valve 13. Switch between position and release position. [Selection] Figure 3

Description

  The present invention relates to a constant water level valve device used for controlling a water level in a water storage tank such as a water receiving tank or an elevated water tank installed in an office building or a condominium.

  In general, the water tank 1 is supplied with water through a water supply valve 3 connected to a water pipe 2, and the water stored in the water tank 1 is pumped through a water supply pipe 5 (see FIG. (Not shown) and supplied to a predetermined consumption point (see FIGS. 1 and 2). In this case, since the water level in the water storage tank 1 decreases as it is consumed, the water supply valve 3 is released as the water is consumed so that a certain amount of water is stored. Water is supplied into the water storage tank 1 and the water level is controlled by closing the water supply valve 3 when a preset water level is reached.

  For controlling the water level, it is known to use a constant water level valve device (sometimes referred to as a ball tap) (see, for example, Patent Documents 1 and 2). These known constant water level valve devices are connected to a water supply valve 3 through a pilot pipe 7 while being installed in the water tank 1, as indicated by reference numeral 10 in FIG. A water outlet 12 for discharging water sent through the pipe 7 into the water storage tank 1, an opening / closing valve for opening / closing the water outlet 12, and a driving body 15 for driving the opening / closing valve are provided. The driving body 15 includes a shaft 40 connected to the opening / closing valve via a link mechanism 20, and a float 42 attached to the tip of the shaft 40 and held in a state of floating in the water in the water storage tank 1. (Refer to FIG. 2 for the configuration of the water discharge port 12, the drive body 15, and the link mechanism 20).

  In the above-described constant water level valve device 10, when the water level in the water storage tank 1 is lowered and the float 42 is lowered at the same time, the shaft 40 rotates in the descending direction, and the opening / closing valve is lowered via the link mechanism 20. Is released. Then, the water stored in the pilot pipe 7 is discharged into the water storage tank 1 from the water discharge port 12, whereby the water supply valve 3 is opened due to the pressure in the pilot pipe 7 being lowered, and the inflow pipe 3 a is opened. The water is supplied into the water storage tank 1 through this. Thereafter, when the water in the water storage tank 1 rises with the supply of water, the float 42 also rises, and the shaft 40 on which the float 42 is mounted rotates in the opposite direction (upward direction), via the link mechanism 20. Then gradually raise the on-off valve. When the water level reaches a certain level (water supply stop water level P1), the on-off valve is closed and the pilot pipe 7 is filled with water, so that the water supply valve 3 is closed and the water into the water tank 1 is closed. Is stopped.

  Further, as shown in FIG. 2, the constant water level valve device has a chain 40A installed at the tip of the lever 21 connected to the link mechanism 20 without using the shaft 40 as described above, and the tip of the chain 40A. A system for fastening the float 42 'is also known. The float 42 ′ encloses a heavy object such as sand inside, and has a buoyancy and a certain weight. When the water level is lowered to a position corresponding to the length of the chain 40A (the water level is lowered to the water supply start position P2) and the weight of the float 42 'acts on the chain fastening type constant water level valve device 10', the link mechanism 20 The opening / closing valve is opened via the valve, whereby the water supply valve is opened and water is supplied into the water storage tank 1. In this case, the on-off valve is urged in the closing direction by an urging means such as a spring. When the position of the float 42 ′ is lowered and the weight of the float 42 ′ starts to act on the urging means, this weight is applied. Acts to open the on-off valve against the force. Therefore, it is dependent on the urging force of the urging means that the water level rises and closes the on-off valve to stop the water supply. The difference in water level between the water supply start position P2 and the water supply stop position P1 is the above-described shaft system. Compared to

  The above-described water storage tank 1 is provided with an overflow pipe. This overflow pipe is arranged to allow the water in the water storage tank 1 to flow out to the outside when the water exceeds a certain amount (predetermined overflow surface). The hopper 101 is installed with the end portion bent upward and bent. The position of the opening edge 101 a of the hopper 101 is the overflow surface P. When the water exceeds the overflow surface P, the water is discharged from the hopper 101 to the outside through the discharge pipe 100.

  In addition, the water storage tank 1 is obliged to install an alarm device so that early detection is possible when a water leakage accident occurs. The alarm device 120 operates when the water level reaches a predetermined position (full water alarm position) P3 within the range between the water supply stop surface P1 and the overflow surface P, and the water level is the full water alarm position P3. If it exceeds, an alarm is issued to the outside. For example, the alarm device 120 includes two electrode bars 120a and 120b, one electrode bar 120a is installed in the water of the water storage tank 1, and the other electrode bar 120b is connected to a predetermined full water alarm position P3. Position and install so that That is, when the water level rises and reaches the electrode rod 120b, the alarm device is energized and is configured to issue an alarm to the outside.

JP 2003-342980 A JP 2011-231912 A

  By the way, tap water contains chlorine, and the Waterworks Law requires that the amount of residual chlorine in the water supply from the faucet be a certain value (0.1 mg / L of free residual chlorine) or more. . In the water tank 1 described above, when the amount of water used is reduced at the supply destination, the amount of residual chlorine is reduced. Therefore, it is necessary to reduce the amount of stored water in order to satisfy the residual chlorine standard. Arise. In this case, in order to reduce the amount of water stored in the water tank 1, it is necessary to lower the water level at the water supply start position P2 by maintenance work. In the constant water level valve device 10 using the shaft 40 as shown in FIG. It is necessary to replace it with a shaft longer than the shaft used so far. Further, in the constant water level valve device 10 ′ using the chain 40 </ b> A as shown in FIG. 2, it is necessary to replace it with a chain longer than the chain used so far.

  Thus, in the constant water level valve device installed in the conventional water tank 1, when the water supply start position P2 is lowered, it is necessary to replace the shaft 40 or the chain 40A with a long one, and the workability is poor. The problem arises. Further, in the constant water level valve device 10 ′ using the chain 40A, as described above, since the water level difference between the water supply start position P2 and the water supply stop position P1 is small, the water supply and stop are frequently repeated to vibrate in small increments. It is easy to cause so-called chattering, and such chattering is easily amplified and transmitted to the main valve (water supply valve 3), which may hinder the opening / closing operation of the main valve. In this respect, in the constant water level valve device 10 using the shaft 40, since the on-off valve is opened and closed by the rotation of the shaft 40, it is possible to ensure a certain level of water level difference, but as described above, it is replaced with a long shaft. In addition, the weight increases and the shaft 40 is easily bent due to water pressure or the like, and the operation of the on-off valve becomes unstable (the water supply start position P2 and the water supply stop position P1 become unstable).

  The present invention has been made paying attention to the above-described problems, and can easily adjust the water supply start position, and ensures a water level difference between the water supply start position and the water supply stop position to stabilize the on-off valve. It is an object of the present invention to provide a constant water level valve device that can be operated in this manner.

  In order to achieve the above object, the present invention is connected to a water supply valve through a pilot pipe in a state installed in the water tank, and the water sent from the water supply valve through the pilot pipe is stored in the water tank. In the constant water level valve device that opens / closes the water supply valve by switching the internal pressure of the pilot pipe by discharging / stopping in the water, the constant water level valve device is configured to store water sent through the pilot pipe into the water storage tank. A water outlet for discharging water, an on-off valve for opening and closing the water outlet, an urging means for constantly urging the on-off valve toward its closed position, and an urging force by the urging means at the closed position of the on-off valve A main body having an auxiliary force generating means for generating an auxiliary force for assisting, and a driving body that is provided in the main body and drives the on-off valve, and the driving body is connected to the on-off valve. Open / close valve closed position A link mechanism that is displaced between the first and second release positions, a guide member that has a first weight and hangs down from the support portion of the link mechanism toward the water, and a second weight that is movable to the guide member The float is floated along the guide member and is floatably attached to the guide member, and a floating range in which the float can float freely is defined in the vertical direction to stop water supply. An upper stopper for specifying the position and a lower stopper for specifying the water supply start position so that the on-off valve is released from the closed state when the float descends from the water supply stop position and comes into contact with the lower stopper. The downward load based on the sum of the first weight and the second weight is a valve closing load based on the sum of the urging force of the urging means and the auxiliary force of the auxiliary force generating means. The downward load based only on the first weight is set to the biasing means so that the on-off valve maintains the released state until the float rises from the water supply start position and contacts the upper stopper. It is characterized by being set larger than the urging load associated with the urging force.

  According to the constant water level valve device having the above-described configuration, the water level in the water tank is reduced while the on-off valve is closed by a valve closing load based on the sum of the urging force of the urging means and the auxiliary force of the auxiliary force generating means. When the float is lowered along the guide member and the float comes into contact with the lower stopper, the second weight of the float acts on the lower stopper. A downward load based on the sum of the first weight of the guide member and the second weight of the float acts. Since this downward load is larger than the valve closing load based on the sum of the biasing force of the biasing means and the assisting force of the assisting force generating means, the link mechanism is operated to release the on-off valve from the closed state. Further, when the water level in the water storage tank rises due to the water supply through the water supply valve accompanying the opening of the open / close valve, the float also rises accordingly, and as a result, the float moves away from the lower stopper. When the float is thus separated from the lower stopper, the second weight of the float does not act on the lower stopper, but the downward load based only on the first weight is larger than the urging load accompanying the urging force of the urging means. Therefore, at this stage, the on-off valve is not closed by the urging force.

  Subsequently, the water level in the water storage tank continues to rise, and the float rises along the guide member.As a result, when the float comes into contact with the upper stopper, the buoyancy of the float received from the water is increased by the upper stopper (and hence the guide member first). 1 weight). At this time, the first weight is reduced by the buoyancy, and the downward load associated therewith is less than the urging load associated with the urging force of the urging means. Therefore, the link mechanism is operated and the on-off valve is closed by the urging force of the urging means. Further, in this closed position, the opening / closing valve also receives an assisting force by the assisting force generating unit in addition to the energizing force by the energizing unit.

  And in this state where the on-off valve is closed by the valve closing load based on the sum of the urging force of the urging means and the auxiliary force generating means, the water in the water tank is consumed and the water level in the water tank becomes When it starts to fall, the float also descends accordingly, so that the float moves away from the upper stopper. At this time, the buoyancy of the float does not act on the upper stopper, and only the first weight of the guide member acts on the link mechanism. The first weight remains until the float comes into contact with the lower stopper (second Until the weight is applied, the on-off valve is set to remain closed.

  Thus, according to the constant water level valve device having the above-described configuration, the on-off valve is not released until the float contacts the lower stopper, and the on-off valve does not close until the float contacts the upper stopper. Therefore, by adjusting the positions of the upper and lower stoppers with respect to the guide member, the float floating range for switching the on-off valve between the closed position and the released position, that is, the water supply start position and the water supply stop position can be easily achieved. Can be adjusted. Therefore, it is not necessary to replace the driving body parts such as the shaft and the chain in order to lower the water supply start position so as to satisfy the residual chlorine standard as in the conventional case, so that not only the workability is improved but also the parts replacement is accompanied. Various inconveniences due to weight increase (for example, unstable operation of the on-off valve due to shaft weight increase or deflection due to the use of a long shaft) can also be avoided. In addition, a sufficient water level difference between the water supply start position and the water supply stop position can be secured to prevent chattering, thereby realizing a stable operation of the on-off valve.

  According to the present invention, it is possible to easily adjust the water supply start position, and to obtain a constant water level valve device in which the water level difference between the water supply start position and the water supply stop position is secured and the on-off valve can operate stably. It is done.

BRIEF DESCRIPTION OF THE DRAWINGS It is an example of the water storage tank which can install the constant water level valve apparatus which concerns on one Embodiment of this invention, Comprising: The schematic with which the constant water level valve apparatus which concerns on a conventional example was installed. In the water tank shown in FIG. 1, the figure explaining the schematic function of the state in which the constant water level valve apparatus which concerns on the other conventional example was installed. The side view which has a partial cross section of the constant water level valve apparatus which concerns on one Embodiment of this invention which shows the state which the float contact | abutted to the lower side stopper and the on-off valve released. The side view which has the partial cross section of the constant water level valve apparatus which concerns on one Embodiment of this invention which shows the state which the float contact | abutted to the upper side stopper and the on-off valve closed. The expanded side view which has a partial cross section of the main body side part of the constant water level valve apparatus in the state of FIG. The expanded side view which has a partial cross section of the main body side part of the constant water level valve apparatus in the state of FIG.

  Hereinafter, an embodiment of a constant water level valve device according to the present invention will be described with reference to FIGS. 3 to 6. In these drawings, the same reference numerals are given to the portions common to the configurations shown in FIG. 1 and FIG.

  The main body 10A of the constant water level valve device 10 of the present embodiment flows in through the connecting pipe 11 and the cylindrical connecting pipe 11 extending in the horizontal direction so that the pilot pipe 7 from the water supply valve 3 is connected. A cylindrical water discharge port (water discharge pipe) 12 extending in the vertical direction so as to discharge the incoming water is provided. An open / close valve 13 that reciprocates (back and forth) in the horizontal direction, for example, is disposed in the internal space between the connecting pipe 11 and the spout 12, and the valve body of the open / close valve 13 is located inside the main body 10 </ b> A. It abuts against the formed flange (valve seat) 10a.

  In this case, the on-off valve 13 is moved to the rear side (the right side in FIGS. 3 to 6) so as to contact the flange 10 a and block the communication state between the connection pipe 11 and the water discharge port 12 (blocking position). A packing 89 is disposed between the flange 10a and the valve body of the on-off valve 13), and is moved away from the flange 10a by moving to the front side (left side in FIGS. 3 to 6). Thus, the connection pipe 11 and the water discharge port 12 are brought into an open state (release position). The forward / backward movement of the on-off valve 13 for opening / closing the on-off valve 13 is guided by inserting the piston 18 integral with the spindle 39 supporting the on-off valve 13 into the cylinder 19. Yes. Here, an O-ring 90 is interposed between the outer surface of the piston 18 and the inner surface of the cylinder 19 (sliding surface). A cap 10B that closes the internal space of the main body 10A is attached to the front end of the main body 10A.

  In addition, the water sent through the connecting pipe 11 has four groove-like recesses (in this embodiment, at equal angular intervals in the circumferential direction of the cylinder 19) as flow paths formed on the outer peripheral surface of the cylinder 19. It is adapted to flow into the cylinder space S1 between the piston 18 and the on-off valve 13 through the Further, the spindle 39 is provided with a vent hole 99 communicating with the outside air so that the air in the cylinder space S2 located behind the piston 18 does not hinder the movement of the on-off valve 13 in the closing direction (rearward). (See FIG. 5 and FIG. 6).

  The main body 10A of the constant water level valve device 10 further includes urging means for constantly urging the on-off valve 13 in the closing direction (closed position). Specifically, in the present embodiment, the biasing means is constituted by a compression spring 65 inserted between the inner surface of the cap 10B and the front end surface of the on-off valve 13.

  In the present embodiment, the force (water pressure × the pressure receiving area of the piston 18) exerted on the piston 18 by the water pressure in the cylinder space S1 between the piston 18 and the on-off valve 13 (water pressure × the on-off valve). The pressure ratio of the pressure receiving area of the on-off valve 13 and the pressure receiving area of the piston 18 is set so that the water pressure in the cylinder space S1 between the piston 18 and the on-off valve 13 is opened and closed. It acts so as to close the valve 13. However, there may be a case where these force relationships fluctuate due to fluctuations in water pressure or the like, and the on-off valve 13 cannot be reliably held at the closed position only by the urging force of the compression spring 65. Therefore, the constant water level valve device 10 of the present embodiment generates an auxiliary force that assists the urging force of the compression spring 65 in the opening / closing valve closing direction in order to securely hold the opening / closing valve 13 in the closing position. Auxiliary force generation means is further provided.

  Specifically, such auxiliary force generating means is constituted by a magnet 60 in the present embodiment. The magnet 60 has an annular shape and is disposed in the cylinder 19 behind the piston 18, and a clamping nut 97 made of a magnetic material (for example, iron) for fastening the piston 18 to the spindle 39 is magnetically connected. (Accordingly, the on-off valve 13 held by the spindle 39 is attracted toward the closed position), and the clamping nut 97 is received inside (attracted magnetically) at the closed position of the on-off valve 13 ( 4 and 6), the on-off valve 13 is securely held in the closed position.

  The auxiliary force generating means may be realized only by the area ratio between the pressure receiving area of the on-off valve 13 and the pressure receiving area of the piston 18 described above, but in that it is not necessary to consider such an area ratio. Alternatively, the auxiliary force generating means is preferably realized by the magnet 60 in that the on-off valve 13 can be reliably closed and held.

  The on-off valve 13 is driven in the front-rear direction between the closed position and the released position by the driver 15. In this case, the driving body 15 is connected to the on-off valve 13 and is displaced between the closed position and the release position of the on-off valve 13, and a support unit 40 connected to the link mechanism 20 (for example, the present embodiment). In the form, the guide member 70 hangs down from the long lever member) to the water, and is movably held by the guide member 70 in a state of floating in the water in the water storage tank 1 so that it can float along the guide member 70. And a float 42.

Here, the configuration of the link mechanism 20 will be described.
The link mechanism 20 includes a plurality of first to fourth arm members 21, 24, 26, and 28 that are rotatably supported with respect to each other, and the fourth arm member 28 includes the support portion 40 (the driving body 15). The second arm member 24 is connected to the on-off valve 13 side (specifically, the spindle 39 extending from the piston 18 that supports the on-off valve 13).

  The first arm member 21 is rotatably supported by a bracket 29 including a pair of opposing support plates fixed to the upper end surface of the main body 10A. Specifically, the first arm member 21 has a rear end positioned between a pair of support plates of the bracket 29 and a substantially T-shaped (or substantially Y-shaped) screw 22 (hereinafter, all the screws have the same shape). It is supported rotatably. Further, one end (the upper end in FIGS. 3 to 6) of the second arm member 24 is rotatably supported by the front end of the first arm member 21. Specifically, the second arm member 24 is sandwiched by a support portion 21 a that is bifurcated at the front end of the first arm member 21 and is rotatably supported by a screw 23.

  Further, the intermediate portion of the second arm member 24 is rotatably supported by the front end of the spindle 39 that extends outward through the cap 10B. Specifically, the second arm member 24 is formed by a pair of support plates 24 a that are joined to each other, and these support plates 24 a are spaced apart from each other and formed in the middle portion of the second arm member 24. When the front end of the spindle 39 is inserted into the opening, the second arm member 24 is rotatably supported by the screw 25 with respect to the inserted spindle 39.

  Further, the other end (the lower end in FIGS. 3 to 6) of the second arm member 24 is rotatably supported by the front end of the third arm member 26. Specifically, the third arm member 26 is composed of a pair of opposing support plates 26a, and the third end of the second arm member 24 is thirdly connected by screws 27 with the other end sandwiched between the support plates 26a. The arm member 26 is rotatably supported. The rear end of the third arm member 26 is rotatably supported by a screw 31 on the front end of the fourth arm member 28 positioned so as to be sandwiched between the support plates 26a. Further, an intermediate portion of the fourth arm member 28 is rotatably supported by a screw 30 with respect to a U-shaped bracket 29 extending from the water outlet 12. That is, the on-off valve 13 is connected to the link mechanism 20 of the drive body 15 configured as described above, and is driven in the front-rear direction via the link mechanism 20 by the floating operation of the float 42 described later. It has become.

  In addition to the above-described guide member 70 and the float 42 that hangs down from the support portion 40 connected to the fourth arm member 28 of the link mechanism 20 to the drive body 15 including the link mechanism 20, A pair of stoppers 71 and 72 are further provided above and below the guide member 70, respectively. This will be described in more detail below.

  The guide member 70 of this embodiment is formed of, for example, a metal rope with a built-in glass fiber, and has a first weight G1. The first weight G1 is defined by the weight of the guide member 70 itself (including the weights of the stoppers 71 and 72 and fasteners 73 and 78 described later) and the weight of the weight 79 attached to the lower end of the guide member 70. . Further, one end (upper end) 70 a of the guide member 70 is passed through a hook bolt 40 a screwed to the front end of the support portion 40, for example, and then folded and fixed and bound by a fastener 73. In addition, the other end (lower end) 70 b of the guide member 70 is passed through a hook 79 a fixed to the weight 79, and then folded and fixed by a fastener 78. The weight 79 is preferable in that the guide member 70 can be stably held in a linear state when the guide member 70 is formed of a material that is easily bent. However, the guide member 70 can also be formed from a rigid body that does not flex, and in this case, the weight 79 can be omitted. At this time, the first weight G1 is defined only by the weight of the guide member 70 itself (including the weights of the stoppers 71 and 72 and the fasteners 73 and 78).

  Further, the upper stopper 72 and the lower stopper 71 provided respectively above and below the guide member 70 are detachably attached to the guide member 70 through, for example, nuts 81 so that the positions thereof can be adjusted. The floating range that can be freely floated is defined in the vertical direction. In this case, the upper stopper 72 is attached to the guide member 70 at a position corresponding to the water supply stop position P1 of the water tank 1 described above, while the lower stopper 71 corresponds to the water supply start position P2 of the water tank 1 described above. At this position, the guide member 70 is attached. The attachment positions (positions P1, P2) of these stoppers 71, 72 can be arbitrarily set by attaching / detaching the nut 81 according to the structure of the water storage tank 1, adjustment of residual chlorine, and the like.

  The floatable float 42 held movably by the guide member 70 has a second weight G2, and is movable up and down (floatable) between the upper stopper 72 and the lower stopper 71. Located in. Specifically, the float 42 is formed in a hollow spherical shape, and the guide member 70 is passed through a through-hole 42a that passes through the center of the float 42, so that the float 42 is interposed between the upper stopper 72 and the lower stopper 71. Is held movably. In addition, the float 42 has a weighted body 69 made of, for example, sand or a weight in its internal space. The weight of the weight body 69 defines a second weight G2 together with the weight of the float 42, and is set to be smaller than the buoyancy of the float 42.

  Note that the attachment form of the float 42 to the guide member 70 does not have to be the illustrated form in which the guide member 70 is inserted into the float 42. For example, the float 42 moves up and down on the side of the guide member 70 via some connecting member. The guide member 70 may be movably attached. In short, as long as the float 42 is held on the guide member 70 in a floating state so as to be movable up and down, any attachment form may be used.

  Further, the constant water level valve device 10 configured as described above has the first weight G1 so that the on-off valve 13 is released from the closed state when the float 42 descends from the water supply stop position and contacts the lower stopper 71. The downward load G based on the sum of the first weight G2 and the second weight G2 is the valve closing load F based on the sum of the urging force F1 of the compression spring 65 as the urging means and the magnetic force (auxiliary force) of the magnet 60 as the auxiliary force generating means. Is set larger than. Further, the downward load based only on the first weight G1 is applied to the compression spring 65, which is an urging means, so that the on-off valve 13 maintains the released state until the float 42 rises from the water supply start position and contacts the upper stopper 72. Is set larger than the urging force F1. In this case, when the float 42 rises from the water supply start position and comes into contact with the upper stopper 72, the downward load G is reduced by the buoyancy of the float 42 (it becomes zero if the buoyancy is large), and the on-off valve 13 has a compression spring 65. The urging force F1 moves to the closed position (water supply stop position). At this time, the on-off valve 13 is also urged in the closing direction by the magnetic force (auxiliary force) F2 of the magnet 60 (valve closing load F).

Next, the operation of the constant water level valve device 10 configured as described above will be described.
First, water stored in the water storage tank 1 is supplied with the on-off valve 13 closed by a valve closing load F based on the sum of the biasing force F1 of the compression spring 65 and the magnetic force (auxiliary force) F2 of the magnet 60. When the water is sent to a pumping pump (not shown) through the pipe 5 and supplied to a predetermined consumption point, the water level in the water reservoir 1 is lowered, and the float 42 is continuously lowered along the guide member 70. When the float 42 comes into contact with the lower stopper 71 of the guide member 70, the second weight G2 of the float 42 acts on the lower stopper 71, whereby the guide member is connected to the link mechanism 20 via the support portion 40. A downward load G based on the sum of the first weight G1 of 70 and the second weight G2 of the float 42 is applied. Since the downward load G is larger than the valve closing load F based on the sum of the urging force F1 of the compression spring 65 and the magnetic force (auxiliary force) F2 of the magnet 60, as described above, the link mechanism 20 is operated to open and close. The valve 13 is released (see FIG. 3).

  That is, the spindle 39 is pulled out (moved forward) from the main body 10A against the valve closing load F based on the sum of the urging force F1 of the compression spring 65 and the magnetic force (auxiliary force) F2 of the magnet 60, and the on-off valve 13 is released from the flange 10a. This movement is stopped when the fourth arm 28 of the link mechanism 20 comes into contact with the side wall of the water outlet 12 (the fourth arm 28 comes into contact with the side wall of the water outlet 12 and Release action is regulated). This position (position in FIG. 3) is the water supply start position P2. At the water supply start position P2, the pressure in the pilot pipe 7 decreases, the water supply valve 3 (see FIG. 1) is released, and water is supplied into the water storage tank 1 through the inflow pipe 3a.

  Then, when the water level in the water storage tank 1 rises with the supply of water, the float 42 rises along the guide member 70 accordingly, and as a result, the float 42 moves away from the lower stopper 71. When the float 42 moves away from the lower stopper 71 in this way, the second weight G2 of the float 42 does not act on the lower stopper 71. However, in order to maintain the open state of the on-off valve 13, only the first weight G1 is used. The downward load based on this is set to be larger than the urging load associated with the urging force F1 of the compression spring 65. At this stage, the on-off valve 13 is not blocked by the urging force.

  Subsequently, the water level in the water storage tank 1 continues to rise, and the float 42 rises along the guide member 70. As a result, when the float 42 comes into contact with the upper stopper 72, the buoyancy P of the float 42 received from water is increased. It acts on the stopper 72 (therefore, the first weight G1 of the guide member 70) (see FIG. 4). At this time, the first weight G1 is reduced by the buoyancy P, and the downward load associated therewith is less than the urging load associated with the urging force F1 of the compression spring 65 as described above (in this embodiment, such a load) The volume of the float 42, the first weight G1, and the urging force F1 are set so as to have a force relationship). Therefore, the link mechanism 20 is operated and the on-off valve 13 is closed by the urging force F <b> 1 of the compression spring 65. Further, in this closed position, in addition to the urging force F <b> 1 by the compression spring 65, the magnetic force (auxiliary force) F <b> 2 of the magnet 60 as auxiliary force generating means acts on the on-off valve 13.

  Specifically, as shown in FIG. 4, when the float 42 contacts the upper stopper 72, the weight 79 is lifted by the buoyancy P received by the float 42, and the load acting on the support unit 40 and the link mechanism 20 is reduced. (It becomes zero). For this reason, the spindle 39 is pushed into the main body 10A (moved rearward) by the urging force F1 of the compression spring 65, and the on-off valve 13 is brought into a closed state in contact with the flange 10a, and the support portion 40 is also positioned horizontally. The This position (position in FIG. 4) is the water supply stop position P1.

  At this water supply stop position P1, the pressure in the pilot pipe 7 increases, the water supply valve 3 (see FIG. 1) is closed, and the supply of water into the water storage tank 1 is stopped. At this time, the closed state of the on-off valve 13 is reliably held by the magnetic attractive force of the magnet 60. That is, even when a force exceeding the urging force of the compression spring 65 occurs due to fluctuations in water pressure, water surface, or some impact, the closed position of the on-off valve 13 is reliably held by the magnetic attraction force of the magnet 60.

  In this state where the on-off valve 13 is closed by the valve closing load F based on the sum of the biasing force F1 of the compression spring 65 and the magnetic force (auxiliary force) F2 of the magnet 60, the water in the water tank 1 is consumed and the water tank When the water level in 1 begins to fall, the float 42 also descends accordingly, and as a result, the float 42 moves away from the upper stopper 72. At this time, the buoyancy P of the float 42 does not act on the upper stopper 72, and only the first weight G1 of the guide member 70 acts on the link mechanism 20. However, the closed state of the on-off valve 13 is maintained. In addition, the downward load based only on the first weight G1 is set to be smaller than the valve closing load F based on the sum of the biasing force F1 of the compression spring 65 and the magnetic force (auxiliary force) F2 of the magnet 60. (That is, until the float 42 contacts the lower stopper 71 as described above), the on-off valve 13 is not released.

  As described above, according to the constant water level valve device 10 of the present embodiment, the on-off valve 13 is not released until the float 42 contacts the lower stopper 71, and the on-off valve until the float 42 contacts the upper stopper 72. 13 is not blocked. Therefore, by adjusting the positions of the upper stopper 72 and the lower stopper 71 with respect to the guide member 70, the floating range of the float 42 for switching the on-off valve 13 between the closed position and the released position, that is, the water supply start position P2. And the water supply stop position P1 can be adjusted easily. Therefore, it is not necessary to replace the driving body parts such as the shaft and the chain in order to lower the water supply start position P2 so as to satisfy the residual chlorine standard as in the prior art. Various inconveniences due to the accompanying weight increase (for example, an unstable operation of the on-off valve due to the shaft weight increase or deflection due to the use of a long shaft) can also be avoided. Further, since a sufficient water level difference between the water supply start position P2 and the water supply stop position P1 can be ensured, chattering can be prevented, thereby realizing a stable operation of the on-off valve 13.

  Although the embodiments of the present invention have been described above, the present invention can be modified as appropriate in addition to the above-described embodiments. For example, in the present embodiment, the support portion 40 is connected to the fourth arm member 28 of the link mechanism 20, but the support portion 40 and the fourth arm member 28 may be integrated. Further, the configuration of the link mechanism 20 can be modified as appropriate. For example, the on-off valve 13 of the present embodiment is configured to move in the front-rear direction (horizontal direction) in the main body 10A, but may be configured to move in the up-down direction (vertical direction). Thus, the configuration of the link mechanism 20 can be modified as appropriate. In the above-described embodiment, the auxiliary force generating means is constituted by a magnet, but the auxiliary force generating means is not limited to a magnet, and may be constituted by other elements such as a tension spring. Further, the attaching / detaching method of the stoppers 71 and 72 with respect to the guide member can be appropriately modified.

DESCRIPTION OF SYMBOLS 1 Water tank 3 Water supply valve 7 Pilot pipe 10 Constant water level valve apparatus 10A Main body 12 Water outlet 13 On-off valve 15 Driver 20 Link mechanism 40 Support part 42 Float 60 Magnet (auxiliary force generation means)
65 Compression spring (biasing means)
70 Guide member 71 Lower stopper 72 Upper stopper 79 Weight

Claims (6)

It is connected to a water supply valve through a pilot pipe in a state where it is installed in the water storage tank, and water supplied through the pilot pipe from the water supply valve is discharged / stopped into the water storage tank to stop the internal pressure of the pilot pipe. In a constant water level valve device that opens / closes the water supply valve by switching
The constant water level valve device constantly discharges water supplied through a pilot pipe into a water storage tank, an open / close valve that opens / closes the water discharge port, and the open / close valve toward its closed position. A main body comprising urging means and auxiliary force generating means for generating an auxiliary force for assisting the urging force by the urging means at the closed position of the on-off valve; and provided on the main body for driving the on-off valve A driving body, and
The drive body is connected to the on-off valve and has a link mechanism that is displaced between a closed position and a release position of the on-off valve, and has a first weight and hangs down from a support portion of the link mechanism toward the water. A guide member, a float having a second weight, movably held by the guide member, and floatable along the guide member; and the position of the guide member is adjustable and attached. An upper stopper for specifying the water supply stop position by specifying a floating range in which the float can float freely in the vertical direction and a lower stopper for specifying the water supply start position;
The downward load based on the sum of the first weight and the second weight is such that the on-off valve opens from the closed state when the float descends from the water supply stop position and contacts the lower stopper. It is set larger than the valve closing load based on the sum of the biasing force of the biasing means and the assisting force of the assisting force generating means,
The downward load based only on the first weight is applied along with the urging force of the urging means so that the on-off valve maintains the released state until the float rises from the water supply start position and contacts the upper stopper. A constant water level valve device characterized in that it is set to be larger than the force load.   The constant water level valve device according to claim 1, wherein the first weight includes a weight attached to the guide member.   3. The constant water level valve device according to claim 1, wherein the second weight includes a weight body provided inside the float. 4.   The said float is hold | maintained so that a movement to the said guide member is carried out by passing the said guide member through the through-hole penetrated through the center. Constant water level valve device.   5. The constant water level valve device according to claim 1, wherein the urging unit includes a spring that urges the on-off valve to a closed position.   The constant water level valve device according to any one of claims 1 to 5, wherein the auxiliary force generating means is configured by a magnet that attracts the on-off valve toward its closed position.

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